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The yum repo for SCL is SLAC RHEL6 Server Software Collections (slac-rhel-x86_64-server-6-rhscl-1). These are installed on public login hosts, if you do not have sudo on a host where it is needed, please send an email to to unix-admin@slac.stanford.edu. For Red Hat Developer Toolset Product Life Cycle please see: https://access.redhat.com/support/policy/updates/dts/
The RPM names for the versions of gcc are:
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